In-situ synthesis and lithium storage properties of MnF2 and MnO inserted hard carbon from conjugated microporous polymer

Developing novel carbon anode materials combining Mn-based compounds for excellent lithium-ion storage performance is very sensible. Herein, MnF2 and MnO are inserted into hard carbon to construct an efficient anode (MFO@HC-3) by a simple pyrolysis of the mixture of F-containing conjugated microporous polymer and manganous acetate. When evaluated as an anode for lithium-ion batteries, the MFO@HC-3 delivers an impressive 743 mA h g−1 at 0.1 A g−1 and 239 mA h g−1 at an ultrahigh current density of 5 A g−1. This probably attributes to the incorporation of both hard carbon and Mn-based compounds, which improves electrochemical performance by combining the advantages and preferably resolves the pulverization issue of Mn-based compounds. This work provides original insights into the incorporation of transition metal compounds and carbon materials. [Display omitted] •In-situ synthesis of MnF2 and MnO inserted hard carbon (MFO@HC-3) through one-step pyrolysis.•Mn-salts adsorbed on F-containing conjugated microporous polymer act as the precursor and internal F source.•MnF2 and MnO nanoparticles provide fast electrochemical response.•CMP-derived hard carbon undertakes buffer and stable Li-storage capacity.